Controlling arrangement for setting organs



F. E. LUTZ June 10, 1941'.

CONTROLLING ARRANGEMENT FOR SETTING ORGANS Filed June 30, 1938 2 Sheets-Sheet 1 VINVENTOR FERD/A/AA/D EDI/4R0 Z l/ 7' Z BY m ATTORNEYS June 10, 1941. uz 2,245,150

CONTROLLING ARRANGEMENT FOR SETTING ORGANS Filed June 30, 1938 2 Sheets-Sheet 2 mp3 Fig.4

N V E N TO R mom/Aw mun/w L (/72 BY WM/ AT T'ORNEYS Patented June 10, 1941 CDNTROLLING ARRANGEMENT SETTING OEGANS Ferdinand Eduard Lutz, Berlin, Germany, a signer to Telefunken Gesellschaft fiir Drahtiose Telegraphic m. b. 1%., Berlin, Germany, a corporation of Germany Application June 30, 1938, Serial No. 215 2'25 In Germany July 1, 1937 4 Ciaims.

to compensate for slight detuning such as is caused, for instance, by temperature fluctuations. In certain types of work as, for instance, in airplane direction finding installation it is inconvenient to make adjustments at the receiver since the receiver is usually mounted at a distance from the pilots position.

It is an object of the present invention to devise a remote control arrangement which includes means for making compensating or fine adjustments from the remote point thus permitting exact tuning under all conditions.

A preferred embodiment of the invention is il-- lustrated in the drawings wherein:

Fig. 1 is a circuit diagram illustrating an arrangement constructed in accordance with the present invention for controlling a motor from a remote point;

Fig. 2 is a diagrammatic representation of the layout of the switches;

Figs. 3, 4 and 5 illustrate the operating con- .tacts and one set of levers in various positions;

are provided for connecting the motor M to the battery B. One of these connects the motor Ivi to the battery B through section b1 of switch assembly b, coarse adjustment switch a and switches I and 2. It will be noted that switch a is a polarity reversing switch and that when switch 121 is closed and switches I and 2 are closed the motor M may be operated in reverse or forward as desired by simply throwing the switch a to its extreme upper position for rotation of the motor M in one direction, and to its extreme lower position for rotation of motor M in the other direction." An additional circuit is provided between the battery B and the motor M which includes a polarity changing switch bz used for fine adjustments and switches 3 and 4. Thus with switches 3 and 4 closed the motor M may be operated either in reverse or forward by manipulating the switch b2. Suitably coupled to the shaft l of the tuning device 8 which is driven by the motor M there are provided a pair of lever devices 5 and ii representing one station setting and a second pair of lever devices 5, 6 representing a eeond station setting. The 1evers 5 and 5' which will be referred to hereinafter as fixed levers are arranged so as to be ad justable on the shaft in relation to each other and fixed in any desired position by the aid of clamping means such as set screws. The levers 6 and 5 which will be referred to hereinafter as drag levers are freely mounted on shaft 1 and are fitted with pins Q which cooperate with corresponding slots or grooves formed in the fixed levers 5 and 5 respectively. As shown in Fig. 6 the levers 55, ii operate normally closed switches l and 2 respectively of the switch assembly while the levers 5 and 5' operate normally closed switches 3 and i. The arrangement is such that the switches l, 2, 3 and t are opened by their respective levers.

The operation of the system is as follows: With the system at rest all four of the contacts I, 2, 3 and i are closed. As previously pointed out coarse adjustment switch a serves to throw the motor into either clockwise or counter-clockwise rotation for coarse adjustment. Switch assembly b is made up oi two sections or and In, section In is closed when it is desired to operate the motor by the switch a, while section be is open. It should be understood that switches a, b1 and b2 are arranged so that when released they assume a central position between their respective contacts, in other words, the switch blades do not contact any of the contacts of the switches. For fine adjustment purposes the switches a and in are released which means that the switches are open and switch 272 is operated to one or the other of its extreme positions depending upon the direction it is desired to make the correction. The motor energizin circuits may be traced as follows: For coarse adjustment switch in is closed and the motor is energized by battery B for rotation in one direction through a connection from the plus side of the battery B, through lower blade of the switch bi now closed, lower blade of switch a it being understood that the fixed to the shaft 1.

switch is swung down to its lowest position for rotation of the motor in one direction, switch 2, motor M, upper blade of switch a, upper blade of switch hr, back to the negative side'of the battery B. For rotation of the motor in the other direction the switch a is thrown to its uppermost position and the circuit from the battery to the motor is as follows: From the positive end of battery B through lower blade of switch in, lower blade of switch a, middle contact of switch a, motor M, switch I'which is closed, upper contact of switch a, upper blade of switch a, upper blade of switch in back to the negative side of the battery. It is' to be understood that when the motor is controlled by means of switch a the switch in is in its released or open position. For fine adjustment purposes the circuit, may be traced as follows, it being understood, of course, that the switch 121 is released which means that the switch is open: For one direction of rotation of the motor the energizing circuit extends from the positive end of the battery B through lower blade and lower contact of switch 112, switch 3, motor M, middle contact and upper blade of switch b2 back to the negative side of the battery. For fine adjustment of the motor M in the opposite direction the switch 172 is thrown to its uppermost position and the energizing circuit is as follows: From the positive side of the battery B through lower blade and middle switch of b2, motor M, switch 4, upper contact and upper blade of switch 192, back to the negative side of battery B.

The tie-up between the levers and the switches I, 2, 3 and 4 is as follows: It is assumed that the element to be adjusted is fixed to the shaft 7 and as previously described levers and 5 are The fixed levers have the slots which are engaged by pins 9, 9 of the drag levers 6, 6 it being understood that the drag 1evers are not fixed to the shaft but may be rotated thereon. The fixed levers 5 and 5' act upon the contacts 3 and 4 while the drag levers 6 and 6 act upon the contacts i and 2 as is clearly disclosed in mg. 6.

In the position shown in Fig. 2' it will be seen that the switch 1 has just been opened by the lever 5 so that the motor comes to rest due to the fact that the motor circuit is broken. Now let us suppose that it is desired to tune the receiver to the station represented by the lever 6'. For this purpose switch in is closed and'the coarse adjustment switch a is operated so that the motor will be rotated in a counter-clockwise direction. This starts the shaft 1 rotating counter-clockwise. As the lever 5 passes over the contact 3, the switch 3 will be opened for a short time but this has no action becausejthe switch ha is in a released position which means that the battery B is not connected to the motor M through the switch 3. As the shaft I continues to rotate counter-clockwise the drag lever 5 is taken up by the fixed lever 5 and rotated with it thus allowing switch i to close. However, this is also without effect because the switch a due to the fact that counter-clockwise rotation was desired was swung over to its lowermost position so that switch was not connected to the battery B. As the shaft continues to rotate it carries with it lever 5' which in turn drags along the lever 6. As the lever 5 passes switch 3 the switch is opened but this is without effect because as previously stated the switch in is in its released position. However, when the lever .6 reaches contact 2 switch 2 is opened, hence the motor is cut off from the battery B and stops.

If the tuning is not exactly correct, the operator may by operating the switch 122 correct the tuning position to one side or the other by releasing switches a and b1 and operating switch b2 in one direction or the other depending upon the correction desired. The amount of correction available on one side is limited by the contact 3 and on the other side by the contact 4, it

being understood that the opening of either of switches 3 or 4 by the lever 5' will stop the motor.

In the positions of levers 5 and 6 shown in Fig. 3 it will be seen that the lever B has opened the switch! thus stopping the motor and that fine adjustments may be made by operating the switch 192 after releasin switch hr. The diagram shown in Fig. 4 illustrates how the lever 5 picks up the drag lever 6, while the diagram in Fig. 5 illustrates all of the four contacts in closed position due to the fact that the levers 5 and 6 are beyond the contact positions.

For application of this arrangement to a greater number of fixed tuning positions, reference may be had to German Patent No. 583,866.

I claim:

1. In a remote control arrangement for radi receiving apparatus and the like, an electric motor for operating the receiver tuning means, a first motor circuit including coarse adjusting means operable to connect the motor to a supply source for rotation thereof, a plurality of operable switches for stopping the rotation of the motor at certain predetermined positions, a plurality of switch operating devices operable with said tuning means and adjustable relative thereto, each of said switch operating devices having coupled thereto through lost motion driving means an auxiliary switch operating device, said auxiliary switch operating devices being disposed relative to said operable switches, a second motor circuit in shunt with said first circuit and including a fine adjustment controller operable to connect the motor to said source for rotation of the motor in either direction and to disconnect the, motor from the source to stop the motor, said second motor circuit including limit switch devices for stopping said motor at predetermined limits of operation a small distance from either side of anyone of said first named positions said limit switch devices being disposed for operation by said first named switch operating device.

2. In a remote control arrangement for radio receiving apparatus and the like, an electric motor for operating the receiver tuning means, a supply source for said motor, a first motor circuit including switching means for connecting the motor to the supply source, a plurality of operable switches cooperating with said motor circuit for stopping the rotation of the motor at certain predetermined positions corresponding to the various tuning positions desired, a plurality of switch operating devices operable with said tuning means and adjustable with relation thereto, each of said switch operating devices having coupled thereto through lost motion driving means an auxiliary switch operating device said auxiliary switch operating devices being disposed so as to operate said operable switches, a second motor circuit including a controller device operable to connect the motor to said source for rotation of the motor in either direction and also to disconnect the motor from the source to stop the motor, limit switch devices in said second motor circuit for stopping said motor at predetermined limits in either direction from any one of said first named positions, said limit switch devices being disposed for operation by said first named switch operating devices, said limit switch devices being arranged with respect to said plurality of adjustable switch devices so that the motor may be rotated a short distance on either side of the position to which it is adjusted by said first motor circuit.

3. In a remote control arrangement for radio receiving apparatus and the like including a control shaft, a reversible electric motor for operating said shaft and a motor circuit including operable switching means for connecting the motor to a voltage supply source for rotation of the motor in either direction, a pair of normally closed auxiliary switches arranged in said motor circuit so that the motor is energized through one of said auxiliary switches when said operable switching means is operated to rotate the motor in one direction and through the other auxiliary switch when the operable switching means is operated to rotate the motor in the opposite direction, a second motor circuit including operable switching means for connecting the motor to a voltage supply source for rotation of the motor in either direction, a second pair of normally closed auxiliary switches arranged in said second motor circuit so that the motor is energized through one of said second pair of auxiliary switches when the last named operable switchin means is operated to rotate the motor in one direction and through the other of said second pair of auxiliary switches when the last named operable switching means is operated to rotate the motor in the opposite direction, a lever device rotatable with said control shaft and positioned with respect to said second pair of auxiliary switches so that it opens one of said second pair of switches when the shaft is in a predetermined position and the other of said second pair of auxiliary switches when the control shaft is in another predetermined position, and means driven by said lever device through a lost motion means, for opening one of said first pair of auxiliary switches when said control shaft is in any position within a range of positions which includes at least a part of the range bounded by said first two named positions.

4. In an arrangement as described in claim 3, a second lever device rotatable with the control shaft and positioned with respect to the second pair of auxiliary switche so that it opens one of said second pair of switches when the shaft is in a predetermined position and the other of said second pair of switches when the control shaft is in another predetermined position and means driven by said second lever device through a lost motion means, for opening the other one of said first pair of auxiliary switches when said control shaft is in any position within a range of positions which includes at least a part of the range bounded by said last two named positions.

FERDINAND EDUARD LUTZ. 

